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13 Episodes
S2 E1 - Underground Apocalypse
S2 E2 - Vietnam
S2 E3 - A-Bomb Underground
S2 E4 - Viking Underground
S2 E5 - Hitler's Last Secret
S2 E6 - Maya Underground
S2 E7 - Mob Underground
S2 E8 - Prophecies From Below
S2 E9 - New York: Secret Societies
S2 E10 - Washington D.C.: Seat of Power
S2 E11 - Stalin's Secret Lair
S2 E12 - Katrina Underground
S2 E13 - Secret Soviet Bases
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Synopsis
In "Cities of the Underworld", leave the metropolitan chaos behind to travel deep beneath urban streets into the meandering tunnels, abandoned train lines, dank dungeons, eerie tombs, clandestine hideouts, and forgotten cities that have been lost to the hands of time.
